10 CFR 21.21(b)

10 CFR 21.21(b) is when a supplier can't determine how

(b) If the deviation or failure to comply is discovered by a supplier of basic components, or services associated with basic components, and the supplier determines that it does not have the capability to perform the evaluation to determine if a defect exists, then the supplier must inform the purchasers or affected licensees within five working days of this determination so that the purchasers or affected licensees may evaluate the deviation or failure to comply, pursuant to § 21.21(a).

see also

• 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation